RFC1490 Format

An RFC1490 format used for SNA traffic is configured in the frame relay LLC2 Interface/Bridge Port record. The options, in order of lowest overhead to highest overhead, are:

●Native LLC2 (also known as BNN, or Boundary Network Node). When this format is used, no MAC addresses are transmitted across the frame relay link.

●802.5 SRB (source route bridge) (also known as BAN, or Boundary Access Node. (SmartSwitch 1800 devices support BAN type 1). This format is gen- erally used for 3174 gateways and AS/400s, because they need to see a MAC address).

●802.3 TB (transparent bridge), used when talking to routers that cannot do BAN or BNN.

Subscriber IDs

Subscriber IDs are only used locally within each SmartSwitch 1800 to link records (e.g. SDLC PU record to LLC host record), unless the device is running X.25, SDLC/ LLC2 primary (the SmartSwitch 1800 would be SDLC secondary to the FEP), or logical ports (i.e., QLLC), in which case the subscriber IDs correlate to the static routes defined in the subscriber routing tables.

PU1 Devices

PU1 devices can not be defined as Token Ring attached to the AS/400. AS/400 pro- grammers might try to get around this by defining different device types (i.e., 5494/ PU 2.0 or PU 2.1) to 5294 and 5394 PU1 controllers. However, when this is done, the ACTPU is not spoofed internally, and is sent to the remote controller. The Smart- Switch 1800 cannot accept and respond, and the controller and AS/400 will go into error mode. The 5394 can be RPQed to act as a PU2.1 device (see IBM RPQ 8Q0775); 5294 controllers cannot be RPQed, and must be attached as SDLC devices; there are no issues with the 5494, as it is a PU2.0/2.1 node. 5294s and 5394s can only be directly connected to SmartSwitch 1800 devices via SDLC or X.25 with speeds up to 64 kbps. 5494s can be connected via SDLC or frame relay with speeds to 128 kbps, or by Token Ring or Ethernet/802.3.

3x74s/SDLC over Frame Relay to SNA Host

Host

FEP/

Local

Frame

NCP

 

SS 1800

Relay

3X74

Remote

SS 1800

Figure 3-6 Configuration Example 4

Make sure the following are configured in the local SmartSwitch 1800:

●Protocols (Chapter 5), to load frame relay, SNA, and LLC2, and Bridging (required with LLC2).

●Virtual LAN ID (page 9-17), which is necessary for LLC2 functionality.

Introduction to Database Configuration

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Cabletron Systems 1800 manual 3x74s/SDLC over Frame Relay to SNA Host, Configuration Example
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1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.
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